What will they likely say if i clearly show them this is correct?
They may ask how you came by the information or why you thought to research it. (If they suspect you were prompted by reading 'apostate' sources, their minds will automatically shut down and no reasoned discussion will be possible.)
They may say that the publications say 'it is thought' the kings reigned those lengths of time but it is not proven, and they may direct you to the two 2011 WT articles on Jerusalem's destruction (October and November issues) that suggest 20 years are missing from the conventional time line. (In which case you can bat the ball back in their court and ask that they provide solid evidence for those missing years.)
They may ask you the 'loyalty question' - do you believe this is God's Organization/the GB is the chosen 'faithful and discreet slave' class? (If you say 'no,' you're done for! Evade or affirm or change the subject or act offended that they should even call into question your loyalty when all you are doing is trying to find out the truth of the matter.)